It's not all in your "head". The lumps are real, they are right there and too frequent periods are there too. They're all very real. You can't "control" what your body does, how it responds to stress. A lot of illnesses are stress-related.

The doctors are just not able to help you and, I assume, don't like feeling that limitation.

What's that adage about stupid questions? It's better to ask a stupid question than have to fix a stupid mistake? Better to overreact than underreact! You have a right to your fears and feelings.