How to know what’s pots and what’s not

Hey friends,

I’ve been feeling massively unwell recently; exhausted beyond belief, light headed, losing a lot of weight among other common pots symptoms. How do you tell when things are down to having pots or whether something else is going on? I’m seeing a doctor currently and bloods are all normal, I take ivabradine which had been working ok but the past few months I feel worse again. Is this just what it’s like having a chronic illness? It’s stressing me out not knowing and feeling so crappy all the time I’m not sure what to think.