not able to get wet

my boyfriend and i have been together for a little over 2 months. in the beginning our sex was hot and nasty(in a good way) and now i can’t get wet for him, he could eat me out for 30 minutes straight and try to put it in and it won’t go. when he tries to put it in it hurts really bad and it’s more pain than pleasure. i’m so horny like all of the time i’m going to go crazy and so is he. i’ve tried relaxing and being more in the moment and nothing works. idk what to do. i’ve already went to the dr they said i’m fine everything looks good... HELP!