It may be anxietys, it's pretty common to feel a lot of that with it, sometimes people think anxiety is only panicking or you only feel symptoms the day before or on the day of somthing but its surprising how much you can feel symptoms with what your worried about when it isn't even at the forefront of your mind, there's been times I've been relaxed an felt sick
Although it is worth thinking about seeing a doctor, I can only assume it's anxiety but am obviously not qualified, they can check blood pressures an do bloods etc if they feel they need to, not saying anything would be badly wrong but it is better to even have a chat with them, I found I had a tiny iron deficiency in my blood work which was easily fixed with stuff in the shops as I would get short of breath somtimes an had a tight chest