How Can I Stop Pre-menopausal Greasy Hair?

I've been dealing with greasy hair on a daily basis - I've tried nizoral, Nioxin, vinegar and water, all kinds of shampoos and concoctions - my hair literally starts getting greasy the minute I step out if the shower - it never used to do this. I used to have very long and full hair and it is now noticeably thinner and not even growing anymore! My skin is developing a crepey texture too. I'm only in my 40's - very fit - weigh only 110 lbs - I eat healthy and train with heavy weights - please help

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