Shoulder joint cracking sound and pain.

My Left shoulder joint makes clicking sound when I move up, from last 2 days and has a little pain too. Sound seems like collision of bones. I went to a Orthopaedic Surgeon.He told me that everything is ok.He advised me to stop my gym exercise for 3 months and stop my protein supplement too and recommended me to have UBINEXT-LC tabs twice a day. Further he added that skinny people should not go to gym. But My certified fitness trainer told me to rest for few day and come back after sometime and continue gym and skinny people can do gym. Now I'm totally confused. Should I believe the Orth. Doctor or the fitness expert or should I change the Doctor ie Should I continue Gym or not. Kindly help me in deciding. Regards & Thank you 🙏