Hi Maja, I too had a health scare that was completely manufactured by my anxiety and depression - back in 2013 I was convinced I had colon cancer. I even had a colonoscopy! And they even took out some cultures for biopsy only to find nothing wrong with me. Looking back, it was as if I had lost touch with reality. I also found out that that it’s pretty common for folks like us to be hypochondriacs and have health scares. So, rest assured you’re not alone in this department.
Yes, sert could caused insomnia and I had that, too. But it went away after a few weeks. I remember how horrible it was because I’d be wide awake at night but when then the next day I’d wired or so tired and couldn’t stop myself from yawning and/or stretching. So this is normal.
And to answer your question, yes, sert can also cause more anxieties, but only for a very short period. It caused palpitations for me, but that too went away after a few very difficult days. So this is normal also.
The thing about sleep is this. The more you worry about not being able to go to sleep, the more you will not be able to sleep. Remember back in school when you had to crammed for school and you tried so hard to stay awake but inevitably feel asleep. Try that. Do the opposite. OCD is a sick, sick illness and nothing about it makes sense so you have to turn everything associated with OCD on its heads, which is much easier said than done. If you can’t sleep, just stay awake and read a book, for me, it’s all the genealogies (names) in the Bible. Eventually, you will get tired and fall asleep. And even if you can’t get good sleep, just close your eyes, breathe and relax.
Last but not least, you are going to be ok. It looks like everything is spiraling out of control in your life. But with OCD, every small inconsequential thing is magnified. The important things during this stage that you’re going through is make sure you take your meds and do not miss doses, try to get a bit of exercise and sunlight if you can (a walk really helps), and get enough nutrition (I was really bad, at one point I couldn’t eat and lost almost 30 lbs in one month - I guess, you Brits call it a couple of stones in a month? - as you can tell, I live in the States because the rest of the world is on the metric system except us. We in the US are still using inches and pounds in measurements. ) And try to get rest even if you can’t get sleep. It’s best to try to take one day at a time and know that not each day will be exactly the same., either good or bad. This too shall pass. Hope this helps a bit.