You made the right decision in making this attorney your "old attorney." He shouldn't be waving guns in the air when he is discussing legal issues or real estate deals. If a gun was pulled on you, you should report that to the police, it is menacing. You may have a civil claim as well. Consult further with an unarmed attorney!
Highly unusual that your attorney did not give you a retainer agreement to sign. An attorney should never commence work on a matter without a written understanding of the terms of representation, the fee, etc. I agree that you should first try to work this out with your attorney.
You need MRI's and other tess to determine if you have any disc problems in your back or neurological problems in other areas of your body. The extent of your injuries supportefd by medical documentation will determine your damages claim.
Your doctor prescribed morphine and other addictive narcotics, but "drops" you for trying marijuana to relieve your pain? Sounds like you need to drop him and find a new doctor who cares about your well being!