What do i do? i have this weird throat pain day after giving a bj?

There can be: irritation to the throat from semen for some people. When was the last time you had an STD evaluation?

STD?: Could be a sexually transmitted disease? This would be a major concern. Best to get this evaluated and have someone take a look or swab. If you used muscles that you do not normally use you could have some odd muscle cramp or strain as well.