and yellow discoloration of the skin (jaundice
) suggest liver disease. The history of hodgkin's lymphoma
adds a twist that's hard to nail down: weight loss, jaundice, and abdominal pain could also reflect recurrence of that disease, but it hard to tie lymphoma to hair changes.
I think you need to see your primary care doctor or oncologist as soon as possible and get some blood tests. You'll probably also need a ct scan
of the abdomen.