Every day I have the same symptoms. They typically come in waves randomly through day though the worst is always in the morning after eating breakfast and sometimes like today they've been persistent more frequently.
It starts with a sort of wirey thrumming (like somethings vibrating in my body) and some light thumping in my chest and sometimes an adrenaline tummy feel like when you're nervous. Then it progresses into more noticeable thrumming/thumping, I sometimes feel on edge and my heart rate increases it goes up in stages until about 92/96 then it goes down/back up randomly throughout. I then get sort of body jolts, a tight headache sensation, I feel very cold/have cold rushes, feel really tired and feel like I need to go to the loo. I sometimes then get weak arms and heartburn. If I try to move from laying down during this and walk about my chest feels like its on edge and I feel a bit lightheaded and get like jolts where I feel like im falling. This whole progression can either come on suddenly or build up over an hour and I can either have all or sometimes only some of the symptoms. This also sometimes happens at night though weirdly when it does then i usually feel warm.
i am undermedicated and iron deficient which I am working on so I'm assuming this is all adrenaline stuff? I know both are related to higher levels of adrenaline. It's horrible to experience but helps to know what it is!