Why do i keep passing out ???????????????

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Three times in last six months ,i've lost consciousness after drinking relatively small amounts( ie less than 500ml) Normally my tolerance level for alcohol is much higher..previously i use to consume upto 750 ml without much problems.....but now a days i loose my consciousness juz after consuming upto 500ml.its causing discomfort for me and for my freinds too..... it happens such that after a particular point of time i dont know what i m doing nd cannot remember anything that happened.now even i m afraid to drink with new drinkers or drink publicly.... One of my freinds told me tat it might be due to decrease in the count of (dehydrogenase-the liver enzyme tat breaks down alcohol). he also told tat reduction in some of the blood tissues and some hormones can cause the problem...i had also figured out tat my memry power has came down drastically during the last one year or so...... What can i do to fix this problem.........should i meet a doctor for this ???? I used to drink a lot for the past five years or so.....but i have succeded in reducing the consumption levels.Only during the Last six months ,i found out that my tolerance level has come down drastically,so i feel that there is sme pbm somewhere.................can anybody suggets some solutions for this problem................. (i am arelatively fast drinker.....i havent vomitted till now after drinking which i think itself is a big pbm)