I Have Been On Every Diet Known To Man I

I have been on every diet known to man I do regular exercise currently 3 x 15 mins on step machine and 30mins on a rowing machine I have been most recently on the LCHF diet where I did initially loose 30lb's however have stuck to this and have not lost any more weight. I have pain constantly in my long bones NOT MY JOINTS. I bruise for no reason, I am begining to sprout skin tags in odd places, I have severe sleep apnoea and have a bipap machine on at night. I am 260lb's and 5'7"