Positives

• A long-hauler reported that two weeks after the first Moderna shot, fatigue lifted and they felt like themselves for the first time since getting sick, even being able to stand and wash dishes without major shortness of breath Reddit.
  
  

Negatives

• A 33-year-old female developed persistent panic, chest pain, low-grade fevers, and fight-or-flight symptoms after her second Moderna dose, with symptoms recurring months later after initially improving Reddit.
  
  
• A long-hauler reported feeling amazing for the first week after Moderna, then crashing severely around day 7 with GI symptoms, bed-bound fatigue, neck rash, and a stye — still not back to baseline a month later Reddit.
  
  

Hurdles & Side Effects

• Patient reports about Moderna boosters in Long COVID are highly variable; some report temporary or lasting improvement while others experience significant setbacks, and multiple patients noted switching to Novavax produced fewer side effects Reddit.
  
  
• Moderna uses a higher dose of mRNA than Pfizer, which may explain both stronger initial immune responses and more severe side effects in sensitized Long COVID patients Reddit.