Could this be Encephalitis?

I've been experiencing some extreme physical and mental health issues lately, and in researching them encephalitis, particularly autoimmune encephalitis, is looking like a possibility. All of these symptoms can flare up randomly, and not all symptoms always appear.

Physical symptoms:

• Severe headaches (back and sides of head, feeling swollen, most common symptom)
• Heart palpitations
• Tingling arms
• Vertigo/Nausea (feels like I'm on a rollercoaster that doesn't ever stop)
• Difficulty breathing
• Tightening airways
• Intermittent or alternating chills/fevers

Mental symptoms:

• Confusion
• Severe anxiety
• Brain fog
• Depersonalization-derealization

I had issues like these before, and they initially started after starting HRT and a nasty case of COVID. They come back every now and then, but this past week has been the most severe instance since October/November.