Hello Rena32 -
thank you for your openness. That is the first step in what hopefully will be a healing process.
Your description of your symptoms sounds like a copy of my own troubles. I benefitted very much from taking Seroxat (trade name), officially called Paroxetine. This compound is one of a class of substances, called SSRIs (specific serotonin reuptake inhibitors). Prozac is another, and there are more. In essence, they increase the level of freely available serotonin in your brain; serotonin is one of your natural messengers, or signaling molecules. One brain cell releases it, it 'hooks' itself to another, and then that other cell is activated, simply put.
How exactly the increased level of serotonin 'does its thing' is not very well known. Main theories: in the end of a long chain of events, the level of BDNF (brain derived neurotrophic factor) is increased. BDNF is a 'driver for growth', a molecule that supports proper development of brain cells, and in some spots also increases the production of new brain cells; so you'll understand BDNF is beneficial for your brain. The other main theory: higher serotonin levels, again after a long chain of events, decrease the activity of glutamate, again a messenger substance in the brain (the most ubiquitous one, in fact).
The glumate story is especially interesting. Too much glutamate is linked to overactivity, and an impairment of inhibition in your brain. Thus, it can be directly associated with the main symptoms in OCD.
1. obsessions: overactivity and intrusiveness of very worrisome thoughts. All people have worrying thoughts. But patients with OCD have way too many of them, and they 'won't stop'. You can't inhibit, or suppress them.
2. compulsions: overactivity of ritualistic behaviours. All people have some forms of minor rituals. Could be checking the whole house to see whether everything's properly turned off, just prior to going on vacation; this, while one secretly knows that everything's off anyway, as per usual. But patients with OCD simply have to do these procedures over and over again, on any given day. You can't stop doing it, however much you try. The rituals have one role: they eventually lead to a decrease in the gravity of the obsessions. But this takes very much time.
As said, I really improved after taking Paroxetine. The effects take hold after three to six weeks, depending on the individual constitution and the gravity of the symptoms.
Feel free to ask more, whenever you'd like to,
Cheers, Cuthbert.