Is it that you might not be able to show your gratitude to your Mom?!! Or you have committed some mistakes, and your feel bad about It?!! If you carry a guilt,  it would convert itself in to some  stress, and I think you feel all those symptoms  because of that. It might be useful for you to visit and share  your concerns with a Psychologist.

this obsessive thoughts about your mom is perhaps the cause for not being able to sleep. the obsessive thoughts are a result of some past incidents or some belief system that you have. you will need to be assessed with a detailed history and then only the line of treatment can be decided.