Constant Fatigue and Anxiety: Seeking Advice

The past few months, my energy and motivation have been severely low. These past 2 weeks, it has been at its worst. I am in constant fatigue and fall asleep frequently during the day, I am constantly thirsty, and my appetite is either excessive or non existant with a constant feeling of nausea and dizziness My anxiety has been very high, and I'm having more frequent anxiety attacks and sweating a lot despite having the heating off for days. I just wonder if anyone has had a similar experience and got help? My doctor did 5 blood tests for liver,kidney, diabetes, blood count, and thyroid, but all were clear. I guess it could be my anxiety itself, but these symptoms are more or less identical to though i had with my thyroid cancer (I had a total thyroidectomy and was clear). I am currently on a waiting list to scan some lumps i found in my neck, so I am also worried it may be the effect of them. Any advice would be appreciated 🙏