Pituitary problems and exercise

I was diagnosed with a pituitary tumour not long ago, and was told specifically to put any form of cardio or weight training on the back burner. As a bit of case history I lost 40lb two years ago while attending my local gym, and continued on with the exercise after the weight loss was achieved. I had some health hiccups along the way that were quite serious, so downsized my exercise regime - But was still able to continue.

Nowadays even though I would love to attend gym, I've been told by my Doctor that weight training and cardio would not be good for the condition I currently have. The tumour is hormone based causing excessive prolactin supply.. Considering that prolactin can cause low estrogen and testosterone levels (both of mine are next to nil), it would only aggravate the condition and make it even worse. I have to take in excess of 1200mg of calcium with vitamin D per day, along with a mega complex of magnesium.

I keep getting conflicting information from different practitioners on this issue: Exercise is good for building bone density, but naturally too much exercise can result in demineralisation (if the exercise is excessive and a person goes into overtraining). Because we aren't sure how much my body can handle, he has recommended none of the gym based exercises. We have yet to check my bone density levels considering that lack of estrogen can cause problems in that area. The last time I attempted to do some weight training was just before I was diagnosed. It took two weeks for my body to recuperate from a 20 minute upper body work out, which for me I knew within myself was abnormal.

I've seen some replies from P/Ts on this board. Is there any advice you can give to people who suffer from hormonal issues? I won't be attempting weight training in the near future because of what happened last time. But I will admit I am curious to find what other studies or knowledge some people might have on this? Thanks in advance!