Going back on Zoloft?

About a year ago, I started taking zoloft for severe OCD (Pure O). I started off at 100mg and a few weeks later my doc upped the dosage to 150mg. I dont remember how long it took to work but eventually it did. It didn't stop my obsessive thoughts but it helped my anxiety and made my life much more manageable. A few months ago I decided I didn't need it anymore and I stopped taking it cold turkey. The withdrawal symptoms weren't that bad and after a few weeks I felt even better than when I was on the zoloft. However, I started to feel my anxiety and depression slowly coming back and then on the night of May 1st ( I remember because it was so miserable) I had a huge OCD spike and I felt more anxiety than I had felt since I first started my zoloft. 3 weeks ago I started taking my zoloft again (starting at 100mg) and the first week I felt pretty good but since then I have had a ton of anxiety/obsessive thoughts and I feel like all the progress I made with my OCD has been thrown out the window. Basically, I'm wondering if the zoloft will work for me again and how long it should take before it takes full effect. Also, I'm wondering if all the progress I made with OCD is really all gone or if when the zoloft kicks in I will feel like I did before I quit taking it. Does anyone have any experience with anything like this? Thanks for reading.