Hi , welcome to the community! I'm so sorry to read that you've been flaring for so long. I was able to find the following article, which looks at some responses to a survey we conducted in 2017: https://psoriatic-arthritis.com/infographic/when-your-psa-flare-is-flaring As you can see from one of the infographics, 22% of our community members had experienced a flare that lasted for longer than six months. So, whilst it's not the most common length of time to be flaring, you're definitely not alone in this struggle.
Looking back, I believe I had a flare that lasted for five or six years. During this time I had severe fatigue and spent around 23 hours in bed most days. I was undiagnosed for four of those years and untreated for the whole time (which I think is probably why it lasted for so long). I'm sorry to read that methotrexate isn't helping at the moment. As Lori mentioned, it's probably worth checking in with your rheumatologist about this and your worsening symptoms (if you haven't done so already). I really hope that you can get some relief very soon. Warmest wishes, -Catherine, Community Moderator