too much masterbation

i've been with my husband 8 years- married for over 1. bottom line, i feel he masterbates too much, and at the wrong times- our anniversary, valentine's day, on day's he promises to spend w/ me. we keep going rounds over this b/c i was brought up to think this really isn't okay to do + not having any male influence growing up. i workout, eat right, try to be fit and attractive, but this makes me feel like i'm none of those things. i do have body image issues anyway being seriously overweight and harassed thru school years & in college so i try to take extra good care of myself. we try to talk about this face to face but he can't explain himself and i'm tired of the fighting. i've tried asking if he wants to watch it together ( although not exactaly my idea of fun- but i've at least tried) and i just get ignored. he talks to his band mates/co workers and i feel like all they are doing is laughing about me behind my back. i'm not a joke. i'm serious when i tell him this behavior hurts me and i feel like he doesn't believe me that i'm serious. i told him today i was considering packing a few things and staying SOMEWHERE until he realizes i'm not kidding around about this. he told be he'd get really pissed if i did that. i'm at my wits end- we have no kids but 2 dogs. i really have no idea what to do. this is making me physically upset and ill. please, please, PLEASE someone help me!