Hi Francesca,
Fatigue has long been my number 1 complaint. The joint pain and tendonitis is no fun, but it's the fatigue that has kept me from living my life, feeling satisfied at work, being the kind of parent I used to be, and really feeling like myself. I think what is frustrating also is that because of the flaring nature of PsA, my "good periods" (which were actually great periods at times!) were always a bit tainted with the fear that the fatigue could show up at any time. I have found two things to be very helpful.
1) I've done a lot of work on "pacing" - prioritizing the things that I value, avoiding over-working, asking for help BEFORE I exhaust myself, etc. This has also including making time for daily exercise (even just walking), prioritizing my sleep a bit more (which I still struggle with), and making tough decisions about what to say "no" to (again - BEFORE I'm wiped out). Cognitive-behavioural therapy for chronic pain/chronic illness can be super-helpful - its main components are pacing and working on catastrophic beliefs about pain, fatigue, etc., which just tend to make both of those things worse. Essentially, I try to avoid the "boom and bust" pattern, but it hasn't been easy (Pacing definitely does NOT come naturally to me LOL).
2) I recently started Humira. It took forever to get insurance to cover it, so I went through over a year of ineffective and/or intolerable medications to prove that I needed something else. It has made an ENORMOUS difference. I've had for injections (over about 6 weeks) so far. I'm not pain-free (at least not yet), and I still have to engage in all my pacing work. However, my overall energy has gone WAY UP. Now, I'm just about as tired as any other full-time working parent of young kids (LOL), which is way more manageable than the crushing exhaustion that typically accompanied my flares. I'm hoping it continues!!
I really feel for you. It's so hard to explain to others how impairing the exhaustion is - and in fact, I often doubted MYSELF when I felt that way - like doubted I could be this tired. I may end up feeling exhausted again, at some point, but for now, I'm trying to enjoy the energy, and work on ways to prevent big flare-ups. I hope you will feel some relief soon!