I am the same age and gender. I have the same issues, with more focus on the head and stomach. Went to the doctor about the stomach, failed to mention the head, they told me I could have Crohn's disease, and ordered a colonoscopy and endoscopy to which I failed to attend... Oops, but no thanks. I am also anaemic and was lacking in B-12 and vitamin D. The head situation has been getting somewhat alarming, but I've had some form of those headaches for over a year. I also had a sore neck the day after I hit my head, (which I did again a few days after), and it's been the cause of increasing concern ever since. I also get severe but relatively short-lived pains in my lower abdomen at times, much like the headaches but I feel have more to do with the parts of it that aren't the stomach, perhaps the intestine or the more female parts of the lower internal abdomine. Nothing suss, though, I assure you.
These things may all be related but I don't know because I don't take particularly good care of myself, being the age that I am, if you know what I mean. I am interested in the answer to your question and to know if we're in the same boat.
Sorry for the hope that this was an actual help, and also for your subsequent disappointment.
Im new at this so I really don't have a clue what I am doing, sorry! But I forgot to write that another problem im having is I feel sick to my stomach. I haven't thrown up or anything I just don't feel right.