kmarti,
Oh how I can relate to you!! After I had my son everything change for me. After finding out that the high blood pressure I got at the end of my pregnancy didn't go away and that I would have to be on meds for the rest of my life, I began worrying constantly that I was going to have a heart attack, stroke, pulmonary embolism, etc. It took me nearly a year to come out of it but when I get anxious, especially around my menstrual cycle, I start fearing that something is really wrong. It is totally irrational and that is what I have to tell myself each time I begin worrying. I have been checked out, had EKG's, tests ran, EP study, etc. and everything was normal. I tell myself that I am young and healthy and if something was wrong they would've caught it. Maggie had great advice for you. Try not to obsess about it because anxious thoughts feed the cycle and it will only make things worse. When you start panicing or thinking you have this or that, first - stay away from the computer and do not google any diseases because you will most likely have atleast one of the symptoms (i know from personal experience) and it will make things much worse. Second - try to do some breathing exercises, especially if you feel short of breath or dizzy or your heart races. Just breath in to a count of 5 or 6, hold for 2, breath out to a count of 7 or 8. This really helps me but you have to keep at it and do it more than once to reap any benefits. Third - pay attention to your anxious thoughts and try to debunk them by being more rational. For example, I have chest pains I must be having a heart attack and I am also dizzy. I could be hyperventilating which causes dizziness and chest pains so I'll do some breathing exercises and see if they go away.
You will get better and you will come out of this. You are definitely not alone because I worried all the time that I had something wrong with me. Your mind is a powerful thing and can convert anxiety and emotional distress into physical symptoms like numbness/tingling/backaches (Ex. conversion disorder). You can also have psychosomatic symptoms which aren't related to a physical problem, but an emotional one. Hang in there, be strong, and you will get better. Keep us posted.