I am experiencing groin lump and when i'm on my period which i am now i get night sweats which drench me, i also have very bad health anxiety, scared?

Need to see your doc: There are many different possibilities with the concerning systemic symptoms you are describing and it would be best to see your doctor.

See a gynecologist: your symptoms sound concerning, please see a gynecologist to get examined and tested for possible sexually transmitted diseases and to have a pelvic exam to look for any possible causes of your swelling.

Need seen: you need to see a live doctor. You probably need a biopsy of that lump, and a ct scan of your chest and abdomen.