Hello Debora: You remind me of me...long time ago. Yes, I remember those nights without sleep. Those were the symptoms I experienced, tingling down the left arm and neck and jaw and tongue. I used to get chest pains too, tight, retricting. Of course thought it was heart attack or stroke as my pressures would go up too. I also was weak and tired and headachey often. And my sister was dying of cancer and I felt so helpless, unable to help her. I had already lost two brothers, now I was losing a sister.
Now the GOOD news. It was anxiety and stress causing it. Once I knew I was healthy that there were no real physical reasons for feeling these symptoms, once I realized that it was my anxieties then I could better accept that I had to learn to "take it easy", learn how to relax. Easier said than done I know. I can only say that it takes time. It will not come overnight.
Where do you start? The CBT program. I don't know how far along you are studying, but I hope you have been doing the homework for it too. Whatever you do, don't give up on it. I found the relaxation ex. very important to do every day, like taking a prescription daily.
Next, where can you "let go", where and when can you find time just for you. Anything will do, a hot bath, shower, a short walk around the block, reading, going out for coffee with a girlfriend and be interested in her, not you. Find something which you find relaxing and give this time to yourself as a gift and use it.
What about nutrition? I quit coffee for about a yr. or more, drank only herbal teas, didn't even eat chocolate to get away from caffeine. Try and eat very healthy right now. Have a bedtime ritual, hot bath, hot milk to sip on later, maybe read a bit 'til sleepy, lights out. Then your body recognizes the routine you choose and starts to relax into sleep. This is instead of going to bed and thinking "oh darn, am I going to sleep tonight?" Stop the negative thoughts and bring on the positives. What was good about your day? What three things are you thankful for? What are you looking forward to for tomorrow? I do some visualization about something I like, or would like to do in the future. I especially like to dream about a cottage on the lake with a nice breeze coming in, sailboats on the water and those huge granite rocks with moss hanging over the lake or those pines which smell so heavenly when it gets hot. What do you like to see and smell? Think about these lovely things before sleep.
These are just suggestions and I hope you can get some ideas from the above. Keep the faith, it will get better.
Sunny