I've had similar experiences. The problem is when you go see a doctor and are around medical professionals you feel safer and more relaxed and it can make your symptoms go away or reduce them so to your doctor it looks like you aren't really that bad. I am by no means a medical professional but i am a qualified personal trainer and have examined the way fitness and a healthy life style affect my anxiety. I used to get the exact same thing as you, tingly arms, heart rate spikes etc. There are several things you can do that will regulate your heart rate and improve your sleeping. 1) daily exercise- spend at least 20 minutes 2 times a day doing something that elevates your heart rate at a reasonable level, i would recommend one gym session or sporting activity, and then later one mid paced walk, preferably at night, the cool air will help reduce anxiety. Listening to calming music during these sessions will improve their affect. 2) cut out stimulants- as much as we love them coffee, tea and processed sugar cause biochemical changes and accelerate heart rate. As sufferers of anxiety we are more aware of these changes and our mind misinterprets them as a negative. 3) Stretching and good posture- I worked on correcting my posture and also leaned how massage my own neck muscles and it really helped. Literally 5 minutes on youtube can teach you how to properly massage your own neck and this will change your life. There are many main nerves that run through the neck and because of our anxiety we tend to have very tense neck muscles that cramp around the nerves and iterfere with signals or cause additional firing of the nerves. By keeping the muscles around your neck lose you willr educe the stress on the nerve and find it much much easier to sleep. A five minute massage just before bed or after exercise will do you wonders. I hope this helps, best of luck