So anxious.

Ok so trying fro 2nd baby. 1st got pregnant 1st month. Trying for coming up to 3mths now. I suffer from anxiety really bad & it’s making it worse. Was sure was pregnant last month but been having changes to periods over few months & been going for tests. Tests ok at moment but getting such positive signs maybe pregnant but was same last month. No sickness like had with 1st. Stomach pains (but really really bad) & sore boobs. Can anyone suggest what might be if am not pregnant? Sorry needed to get off chest