you actually suffered from mild sunburn
which also caused swelling under eyes and nose.
There is nothing to worry about it as it automatically improves in 48 to 72 hours.
you need to apply mild moisturising lotion to keep the area well hydrated to avoid discomfort.
If you have been getting these episodes in past then you should apply sun screen lotion before going to beach or doing sigficant outdoor activity in strong sun.
Dr Rajesh Kaushash
Cosmetic and Plastic surgeon