Should I see a masseuse or physical therapist?

Or maybe try yoga

Maybe statics would be the perfect exercise to focus on relaxation of specific muscle groups. Start at the head, feel your muscles in the neck, and try to relax them. Then move on to the next muscle, relax it and continue step by step and with a calm mind. It is important to feel the before-and-after difference, and with practice it will get easier to relax your muscles. Good luck!

Neuro muscular massage (a specific discipline) is targeted largely on getting your muscles to relax. You will feel better and it will probably get rid of some things you had no idea were tight muscle related (my experience). However, it probably won't do much for your breath hold time. Yoga, exhale diving, working on finning and surface dive technique, all can noticeably help your dive time, likely much more than fixing your tight muscles.

If you can feel your muscles tightening when you dive, almost certainly you are tense about diving. The opposite should be the case. I'd work on getting more comfortable in the water, then technique, then yoga, then exhale diving. The last will have a very large impact on dive time and relaxation if you have done the other stuff first.

Well, you can go for massage therapy as it can prove to be a great way to have healthy muscles and body. I regularly get massage broward so as to get relaxed and stress free.