I think I got misdiagnosed

Around 8 months ago I got diagnosed with seborrheic dermatitis on my face, but later on I started getting swellings on my hands and feet, and nearby joints like elbows, shoulders and side of armpits. Plus, after checking around internet (I know it's not accurate, but it gave me a hint) I noticed that the rash on my face doesn't matches the seborrheic dermatitis criteria. I'm trying to get an appointment with a rheumatologist, but by insurance it's taking way too long cause there are no doctors available yet. They'll return my call when a doctor is available, but I'm waiting since last month. Every flare it's getting worse and worse, I'm almost freaking out 😓