Hi, I'd like to help you with your question.
It sounds like you may have anxiety. Anxiety is very common for people who are under a lot of stress and feel they have little control over their own lives. That is the nature of anxiety- the feeling that you are out of control. Excessive worry, trouble sleeping, not feeling yourself and trouble concentrating are all symptoms.
You may also have depression caused by the death of your mother. You may not have resolved your grief or the stress of your current situation is reminding you of your loss and if you were close to your mother, you may feel her loss more right now.
You may also be experiencing the stress you are under through your body. Often, when someone is stressed at the level you are right now, they tense their muscles and may not even realize it. As a result, they become sore or develop physical problems related to stress.
What you can do is learn about anxiety, depression (grief) and stress. The more you know, the better you can cope. Self help is a good place to start. Here are some resources to get you started:
The 10 Best-Ever Anxiety Management Techniques: Understanding How Your Brain Makes You Anxious and What You Can Do to Change It by Margaret Wehrenberg
A Life Less Anxious: Freedom from panic attacks and social anxiety without drugs or therapy by Steve Pavilanis and Patricia Alma Lee
The Instinct to Heal: Curing Depression, Anxiety and Stress Without Drugs and Without Talk Therapy by David Servan-Schreiber
You can also learn relaxation techniques to help you stay calm and more focused.
The Relaxation & Stress Reduction Workbook (New Harbinger Self-Help Workbook) by XXXXX XXXXX, XXXXX Robbins Eshelman, Matthew McKay and Patrick Fanning
Therapy may also help. Seeing a therapist will help you express your stress, learn ways to cope and provide support. To find a therapist, talk to your doctor for a referral. Or you can search on line at http://therapists.psychologytoday.com/rms/.
It sounds like you may be sensitive to medications. Some people are. You may try talking with your doctor about giving you lower dosages or trying less potent medications. For sleep, you could also try natural remedies such as melotonin. Melotonin is a naturally occurring hormone in your body that helps you sleep. But it is available in pill form. It can help you fall asleep and stay asleep. It is available at any drug store, Walmart or GNC.
I hope this has helped you,