thank you for your query.
It seems that you are suffering from the post-sunburn
itch.it is a common problem and can be easily overcome.
*Take a good warm no-soap shower.do this daily for ten mins twice a day.
*drink loads of water
*If you have a clean spray bottle fill it up with ordinary every day vinegar and spray it only on the sunburnt parts.
*After vinegar is dry, you can get dressed. Wear comfortable clothes which are not tight or covering sunburned area(s) if possible. The sunburn needs to be exposed to air and not covered
*after 2 coats of vinegar the stinging should stop. Apply oil or moisturizer every 4 hours after that.
don't forget dehydration
increases the severity of sunburn so keep yourself hydrated.
wishing you good health