How to continue martial art practice?

I am 35 year web developer and working 9 hours per day except Sunday. I was dòing martial arts practice before 11 years ago and was not feeling any difficulty. But now when I do practice I feel too much exertion and unable to continue martial art practice next day. I feel very weakness too. I find I can do my... show more I am 35 year web developer and working 9 hours per day except Sunday. I was dòing martial arts practice before 11 years ago and was not feeling any difficulty. But now when I do practice I feel too much exertion and unable to continue martial art practice next day. I feel very weakness too. I find I can do my practice only once a week. Is there any way I could do daily practice without feeling exertion or weakness. I am facing gas, constipation and acid reflux problems too. Constipation problem increases when I do practice. Please suggest...
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