The main thing is to do whatever you are comfortable with. As perfectionists, I think we all have the tendency to try and recover as soon as possible and push ourselves. While it is okay to push yourself, we just need to be aware of the role our TMS personality is playing in everything.
It is also great to hear that you stopped avoiding typing. This was one of the first activities that I did in my recovery, and it really built up my confidence in myself and the TMS approach. Each time I did a new activity I was also a little nervous about it each time. When I think about it, my fear and anxiety about doing these activities revolved around my fear that I would get hurt or my symptoms would get worse.
It sounds like this is sort of what is going on with you. You mentioned the last time you really pushed yourself, your symptoms increased, and you are nervous that this will happen again. But this is where accepting the diagnosis comes in. When you fully believe that you have TMS and understand what it is about, you understand that being physically active will not damage you. You are not frail.
For me, accepting the diagnosis, helped me challenge my beliefs that I was frail and gave me the confidence to really push myself physically. I had really severe knee and leg pain. However, I really enjoyed plaing broomball with friends. At first I thought I couldn't run around and be that active, but once I accepted the diagnosis and being active, I noticed that my symptoms did not worsen.
I will say that part of this requires being stubborn and just go for it. You basically have to decide to focus of your symptoms and to not let them prevent you from doing the activities you enjoy doing. In my case, I just told myself that I do not want to continue to limit myself and that I do not have a structural problem. This allowed me to turn my focus from my leg pain to the activity I loved to do. There is a great thread that you may have read about this called
I'm a TMSer Triathlete. In it Enrique, talks about how he had pain in his achilles and decided to just go out and do an intense FTP test and then run a half marathon.
I would also add that with TMS there is a chance that your symptoms may pop up or flare up the next day. If this happens don't let it distract you. Your unconscious mind will increase your symptoms, because it knows that you are about to root it out and it is desperate to have you focus on it again.
Whether you start playing tennis this week or next is totally up to you. You know your body and where your confidence level is at. There is no right or wrong answer here. Continue to educate yourself about TMS and your repressed emotions and you will get there.