Ya I suggest you get an oximeter to self monitor. I also developed that chest pain starting from Day 2/3. Feel there's pressure on my chest and shortness of breath throughout the day. Got kinda panicked but when I checked my oxygen saturation is 99%. Went to doctor for consultation the next day, doc checked my blood pressure and breathing and pulse, apparently everything is ok. No explanation for the chest pain other than "probably just part of the side effects". Today is slightly more than a week after my 1st dose, the chest pain subsided but got headaches. Not sure related or not.  my appt was same slot as the poor guy that died so maybe im too worried