The cause for numbness and tingling in fibromyalgia is unknown. These symptoms don't follow any anatomic or nerve pattern and they tend to come and go in different parts of the body. Your rheumatologist should be able to help you sort this out by your history, physical exam, lab tests and X-rays. Sometimes I'd rather deal with the pain of arthritis than the consequences of these drugs. Your problem is not unusual.
Constipation is a common side effect of many medications, particularly narcotic pain medications.
As you know all too well, constipation can be a nuisance. If it is not dealt with promptly it can lead to serious health problems. The ways in which medications cause constipation are varied. For one, the medication may cause more water to be absorbed from the colon, leaving a hard, dry stool. The medicine might also alter the digestive process and not allow normal digestion to occur.