super tense muscles

Hi i’m so embarrassed to be writing this but i’m genuinely freaking out and don’t have a whole lot of money to go to the doctors for no reason so please don’t judge me, just wondering if anyone has advice/experience.

Usually inter course and penetration are not particularly uncomfortable for me, i generally enjoy sex and it’s nothing too painful. but i had sex about a week back and now there’s a wall of extremely tense, aching, and painful muscle all throughout my right groin, vulva, labia and i can feel the tension from the inside of my vagina as well. it’s almost rock hard as if i have an entire wall of charley horses, and i started to notice the pain in my groin area about 3 days after the sex. it hurts to walk, sit, and cough.

the pain isn’t unbearable yet and i’ve been trying my best to treat it with pain killers, ice, and heat but it’s really bothersome and i’m worried it’s not getting any better. Is this just muscle guarding of my pelvic floor? any advice for at home remedies or is this something i should look into getting muscle relaxers/more serious clinical help for.