postpartum almost 8 weeks...

Last night I woke up around 2am to make a bottle for my son. When all of a sudden I felt a weird stomach ache then get so nauseas. I went to the bathroom I felt dizzy and I started shaking uncontrollably and very cold with a fast heartbeat. I lied down and fell asleep and woke up feeling better. Could it have been an anxiety attack? I don't sleep much either I'm exhausted.