I'm in your boat. I've been sweating at night 4 months now. It's gotten worse since I stopped my bc pills. Whether that's a coincidence or not I'm not sure. Also been quite itchy off and on for 3 months. I have several pea sized nodes on my groin. My doc has given me multiple exams, chest X-rays, abdom ultrasounds, pelvic ultrasound, and most recently a specific test checking did lymphoma markers. All of these tests have come back normal. Normal as can flipping be! Yet I still think I have undiagnosed lymphoma. But hey, with symptoms like night sweating and itching I'm sorry, but that's the thing my mind locks on.
The lack of appetite sounds like anxiety to me. During my most anxious times I def get that!