The new tongue ulcers (appearing within the last day, on top of the tonsillar white patches, throat pain, and swollen neck nodes) shift the picture more toward a viral cause, which explains why 2 days of cephalosporin hasn't helped at all.
What I can see in your photos
The images mainly show the front/underside of the tongue being held down with a spoon/depressor - the tip and margins of the tongue look reddened and mildly inflamed, with what may be a small pale/white ulcerated patch near the tip in a couple of frames. I can't get a clear view of the tonsils or the back of the throat in these particular shots (the depressor and angle block that area), so I can't confirm whether the tonsillar white spots and the tongue ulcers are the same process just from these.
Most likely explanations now
Combining bilateral tonsillar exudate + bilateral neck node swelling + painful swallowing + new tongue ulcers + no response to antibiotics, the textbook differentials point toward a viral illness rather than plain strep:
- Herpangina (coxsackievirus): causes small (1-2 mm) grey-white ulcers specifically at the back of the mouth - soft palate, tonsillar pillars, near the tonsils - which can match "many small white things" you described near the hard palate junction. Usually resolves in ~10 days on its own; antibiotics do nothing for it - Goldman-Cecil Medicine.
- Primary herpetic gingivostomatitis (HSV-1): causes painful ulcers spread across the tongue, gums, and oral mucosa along with a sore throat and tender neck nodes - fits a new crop of tongue ulcers appearing a day or two into a throat illness.
- Hand-foot-mouth disease (coxsackievirus, can occur in adults too): mouth ulcers plus tonsillar involvement; look for any spots/blisters on palms, soles, or fingers.
- Infectious mononucleosis (EBV): heavy bilateral tonsillar exudate with marked cervical lymphadenopathy is classic; oral ulcers/aphthae can occur secondarily during the immune stress of the illness.
Standard emergency medicine teaching is explicit on this point: when oral ulcers/vesicles are present alongside pharyngitis, this is considered a clinical sign of a viral cause, and testing/treating for strep is not recommended in that setting - Tintinalli's Emergency Medicine, p. 1155; Rosen's Emergency Medicine.
One important safety flag
You are still on a cephalosporin. New mucosal ulcers appearing while on an antibiotic, while usually just the viral illness running its course, can very rarely be an early sign of a drug hypersensitivity reaction (e.g., erythema multiforme/Stevens-Johnson spectrum). Watch closely for:
- Any skin rash, target-shaped spots, or blistering
- Red or gritty eyes
- Lips becoming swollen, cracked, or crusted
- Skin peeling anywhere
If any of these appear, stop the antibiotic and get seen immediately (this is an emergency, not a wait-and-watch situation).
What to do now
Given the combination - not improving after 2 days, new oral ulcers, bilateral neck swelling, and painful swallowing - this needs an in-person re-look by a doctor (physician or ENT), not just continuing the same medicines:
- They can directly inspect the posterior pharynx/tonsils (which your photos don't capture), check for asymmetry, feel the neck nodes, and look for the pattern of ulcers to tell herpangina/HSV/HFMD/mono apart
- A monospot/EBV test or clinical exam may be warranted if nodes are prominent
- If it's viral, the antibiotic may be safely stopped and care shifts to purely supportive treatment
Supportive care in the meantime:
- Keep sipping fluids often, even small amounts, to prevent dehydration since both throat pain and tongue ulcers make eating/drinking hard
- Cool, soft, non-acidic, non-spicy foods (avoid citrus, tomato, salty/spicy items which sting ulcers)
- Warm saline gargles for the throat
- A topical oral gel/rinse for the ulcers can help with pain (ask the pharmacist/doctor for one appropriate for you)
- Continue the pain reliever as already prescribed for comfort
I'd treat this as "go get examined today" rather than waiting further, mainly because of the combination of non-response to antibiotics plus a new symptom (oral ulcers) that changes the likely diagnosis.