Newly Diagnosed with Ankylosing Spondyloarthritis: Seeking Advice

I've been newly diagnosed with ankylosing spondyloarthritis and I just don't know what to do to feel better or if the diagnosis is even correct. I've been misdiagnosed multiple times and have had doctor's contradict each other. TBH I just don't know what to do to feel healthy and happy. I am often tired and in pain, my back neck and knees hurt sometimes cannot even hold me. my body does not seem to like food anymore, I bloat to the point it's painful and constantly am nauseous even to the point of vomiting. any advice would be great.