How long does lingering covid last? Is there any help?

Hello,
I have Covid Delta Variant for 6 weeks now. I’m at end stage of covid/ covid lingering symptoms: fatigue is the worst, chest tightness, shortness of breath, heart beats quick, chest pain, cough, diarrhea, dizziness from sit to standing or move too quickly, some loss of smell . These are my main symptoms. I’m getting better slowly.
Worried and anxious about why I’m still sick not better yet.
I’m fully vaccinated since Feb’2021. Never had covid prior.