I've had 4 sets of trigger point injections done. helps for 3-4 day each time. should i keep getting them. really bad muscle spasm pain. ?

Probably not: If they are lasting only 3-4 days at a time, it is not to your benefit to keep getting them. The bigger and more important question is what is the root cause of your pain and what needs to be done to give you more permanent relief from your pain. If you have not had an mri of the spine and soft tissues in that area you may consider requesting one for a more definitive diagnosis and treatment plan