Obsession has lasted for months. Help or advice please.

I've had the same obsession since late January of this year and it is quite frankly ruining my life. It's been nearly 5 months. I feel like my OCD is completely controlling me - this obsession and the harmful checking compulsions that come with it have an iron grip on me and it hurts so much, it's consuming me whole and I can't live my life happily. The obsession is sexual and morbid and makes me incredibly unhappy. I keep waiting for this obsession to go away but at best it just slightly fades or I'm not as bothered by it for a few days before it comes back and strikes me.

I've tried to ignore my compulsions - the most I've lasted not checking is maybe two months, but I broke two days ago and have since checked twice. My compulsions are so strong that I sometimes feel like I could vomit trying to resist them. I've tried to ignore the obsession itself but it doesn't work. It's like torture in my mind. From when I wake up to when I go to sleep, I think about it nonstop. Again, the obsession makes me extremely distressed so you can imagine this isn't the nicest thing to deal with. It even makes me suicidal at times when it's at it's worse.

I'm going to keep trying to fight this but I just want to know that I'm not alone in having a long-lasting obsession. In the past I had an obsession that lasted from about mid-2011 to early 2013 but most of my other OCD-related obsessions go away within days or weeks, it's been a while since I've had something like this on my shoulders.

OCD feeds on fear. The more you fear something the more controll it has over you. Obsessions tend to be about things that scare you. If they didn’t you wouldn’t be worrying about them. Whatever this obsession is it’s probably something you fear ALOT, which is why it’s so intense and is lasting so long.
I am in the same boat as you right now. I have an obsession that’s lasted since July. The only thing I can tell you is that it will eventually go away. Hang in there!!