If you cant afford rehab, you can always get yourself 5150'd. detox while youre in there andhave 24 hour care available... counselors around.

You can try going to the ER saying you feel very sick and dehydrated. maybe they will help detox you there, get your system flushed with IV fluids.

my advice would be to get yourself to some type of medical facility and go from there.
after you detox, you can figure out the unmet needs you have that cause the drinking behavior.

your life is waiting for you to live it. sober.