Yup, I feel like you. I noticed a goiter on my neck in Aug. Had some bloodwork done and they found severe anemia. Started getting severe pain in my abdomen. Went for an ultrasound. Tech said my spleen looked enlarged. Went for a CT scan. Turns out spleen wasn't enlarged but they noticed an abdominal aortic aneurysm. Went for a colonscopy/endoscopy. Found nothing from that. Went for a thyroid ultrasound. Found nodules on both sides of my thyroid. Went for a thyroid biopsy. No indication of cancer on one side but the other side was inconclusive. Now have to go for another biopsy. Also have to see a vascular surgeon about the aneurysm.
Honestly, it may turn out that all of this leads to nothing very serious. My anemia may be caused by irregular, somewhat heavy periods. My goiter may be nothing more than a fluid filled cyst. The aneurysm is small and I may have had it all my life. May never cause a problem.
But this has been quite a roller coaster ride! I was flipping through "how to die with dignity" books at one point. I've always been reasonably healthy and I was blindsided by all this.
However, it's been 5 months since this all started and I'm still alive and kicking so I'm starting to feel more optimistic and hope that this all leads to nothing major.
I hope you find the same thing.