WHY are my legs swelling and won't go down?

For about the past week or two my legs are swelling up - really BAD, I can make a dent in them real deep. I have increased my water intake and keep them elevated all night, but when I wake up in the morning they are still swelled - no relief! My hands and feet are normal, it's just my legs. ALSO, I have been gaining weight (daily) and I have not reached my goal weight yet, so I am eating to lose. But WHY am I gaining? Anyone ever have this problem? Please help! I'm worried and don't know what's going on. Went to doc (not my regular PCP -- she was too busy) and had blood work done. Thyroid fine, a little anemic (haven't been taking both flintstones for awhile, but I am now) , B-12 is elevated (I take 100mcg daily), lipid panel ok, had a chest x-ray - heart and lungs fine too. Otherise, they told me nothing. Help! I will be 3 yrs out in Oct. Started at 206 lbs, down to 127 and now back up to 145. I don't want this happening! Pam

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