I am suggesting to you that if your pain persists indefinitely, thus causing you to change professions, you might want to consider a state program of Vocational Rehabilitation. I am not sure in which state you live, but every state has such a program. It is 80% federally funded by the U.S. Department of Education. In some states this program may fall under the State Dept. of Labor; or Social Services; or Education; or Employment Services, or whatever. Its primary purpose is to help anyone with a "severe disability" which constitutes a handicap to employment, to become gainfully employed. They will do a complete medical workup to determine eligibility for services. All such diagnostic services are free of charge. If you are deemed eligible for services, a plan is written to provide you with whatever services you may require in order to help you get back to work. This could include re-training, vocational counseling, physical restoration of some sort (to include such things as P.T. , O.T. , prosthetic devices, further medical services etc.). And these services could also be no cost to you, subject to a financial means test.
The idea is to provide earnest clients whatever they need to get them employed. This also includes job placement services, as well as needed supplies, tools, equipment etc. needed on the job.
Quite honestly, I hope you will not need any such services; instead, you will experience zero pain, as you return to your mechanics job which you had prior to your medical issues.
Either way, good luck to you!