Orgasm

Im starting to get really worried about my orgasms. As of two days ago I haven’t been able to orgasm from masturbating and I try for 2+ hours every time. Each time I am able to get to my edge very quickly but I CAN’T RELEASE!! This has never been a problem for me before and now it has gotten to the point where I feel backed up and in pain while masturbating. Has this ever happened to anyone????