Constant hip ache/pain worse when resting, can't get comfortable. Had knee arthroscopy 4 weeks ago for torn meniscus but had hip pain prior to op?

Possibly ITB. Many potential causes, one of the moe common is known as ileotibial band syndrome, which runs down the outside of the hip, down the lateral thigh, and inserts on the outside of the knee. Don't hesitate to be seen for a specific diagnosis and to discuss treatment options.