Hello and welcome to healthcaremagic
Acute sunburn can be very painful and discomforting.
If I was the treating doctor I would suggest you to take a short course of an oral
steroids. Oral steroids are rapidly acting and immediately bring down the swelling and discomfort.
In addition to that you could use topical moderately potent topical steroid+antibiotic combination ointment e.g
fluticasone propionate+
mupirocin combination ointment (Flutibact ointment), twice daily over the sunburnt skin, for a week.
Fucidin-H would be milder than flutibact ointment but would still do the job for you provided you also take oral steroids. It contains
Hydrocortisone which is the mildest topical steroid.
An OTC pain killer/anti-inflammatory e.g
ibuprofen or aspirin can be taken twice or thrice daily to relieve the pain and discomfort.
Always use a broad spectrum sunscreen, throughout the day.
regards