Hi, I'd like to help you with your question.
It sounds like the stress of handling the two jobs has caused you to feel fearful of a heart attack. Or you may feel so much pressure from the stress of the jobs that you feel the symptoms in your chest. It is not an unusual place to feel stress and is often the place in the body people manifest their stress.
There are a number of things you can do to help yourself.
One, consider seeing your doctor to rule out any potential heart problems- this is an important first step. You always want to rule out any possible physical issues before you focus on any other causes.
Two, you are overly stressed and need a break- this is most likely what you are feeling. Is there anyway you can step back for a while? Maybe take a long weekend or come home early for a few days.
Talk with your psychiatrist- Is your psychiatrist also seeing you for therapy? If not, you may want to consider seeing a Master's level therapist for talk therapy. Medications are great and are needed, but talking out your problems helps enormously as well.
Work on stopping your obsessive thoughts- this is a multi step process that can help you get a handle on your feelings:
1. Once you have been seen by your doctor and any physical problems ruled out, then practice thought stopping. Whenever you think about your chest, tell yourself to stop. Keep repeating it until you feel better.
2. Keep a copy of the good health report with you so you can check it as needed to remind yourself you are ok.
3. Distract yourself and find other ways to occupy your mind. Keep several tasks on hand and complete them whenever you start to think about your chest.
4. Repeat the opposite feeling to yourself. If you feel upset about your chest, say "there is nothing wrong with me. I am in perfect health. The stress will pass and I feel fine". etc. This will help you change your thought processes.
Here are some books that can help you with obsessive thoughts:
The Imp of the Mind: Exploring the Silent Epidemic of Obsessive Bad Thoughts by Lee Baer
Getting Control by Lee Baer
The Relaxation & Stress Reduction Workbook (New Harbinger Self-Help Workbook) by XXXXX XXXXX, XXXXX Robbins Eshelman, Matthew McKay and Patrick Fanning
You can find these books on Amazon.com or your local library may have them for you.
I hope this has helped you,