It's very likely is that your body is just trying to adjust. I'm not sure about Yasmin in particular, but from what I've learned the average time for a body to regulate itself after coming of a BC pill is about 6 months. I came off the pill and haven't had a regular cycle since and it's been 2 years now. That's likely just that my natural cycles are irregular though... I hope your issues resolve soon!
I'm extremely familiar with Yasmin and it's post-side-effects. I was on the pill for 7 years before I decided to come off of it and let my body regulate itself out, much like what you're wanting to do. About three months after coming off of the pill, my cycles were highly irregular and I experienced similar symptoms to what you're describing. I went to see my gynocologist and she sent me to have an ultrasound of my uterus and ovaries where they discovered that I had Polycystic Ovarian Syndrome (PCOS). Over the years I've learned that it's a very common diagnosis among younger women and comes with a slew of side effects due to being hormonally imbalanced. I suggest you read up on PCOS and see if you can relate to the symptoms. If you can, make an appointment with your gynocologist to see if she can run a blood panel on you and possibly an internal ultrasound. Otherwise, the other diagnosis that came to mind was PMDD. Yasmin and Yaz are both known for helping treat PMDD and that could possibly be why it was working for you so well while taking it. Now that you're off of it, all of your symptoms are returning.