How am I mentally happy, but my body is in mourning???

I am a generally very happy person. The past few days have been very confusing to me. I don’t want to leave my bed, my chest hurts and being alive seems difficult. I’m starting a new medication for my immune disease and now I don’t know what to do. I want to scream for help! But nothing is wrong with me!!! Help meee! I ditched work which I never do, I can’t afford a therapist and I have trouble breathing, eating, socializing. I can’t tell my mom cause she is a bit of a victim? She’s going to make it about how a “mother suffers with her kids” instead of trying to help and understand. She makes my disease about her, my dad is going to tell me he is going to “ pray” and I’m an ATHEIST.

I want to turn of the lights and sleep forever. What can I do?