Have had no appetite for a few days, fatigue, constant itchy legs, swollen painless lymoh node in ny neck, and some joint pain, esp in my feeti?

Viral, autoimmune: This could be a viral infection. Certainly, one thing to consider would be mono. This is typical in your age group. This usually resolves in 5-10 days but if symptoms continue I would also consider doing some lab as a connective tissue disease could also present like this, with some vague symptoms.

Systemic disease: you need to be seen to be tested for infections and lupus/rheumatoid arthritis