Hi Jem!
Some people do naturally have a low BP. It can also cause you to become lightheaded.
I have been feelin' dizzy recently, infact for a total of 4 weeks. I also being a natural worrier of my health have been concerned that i have a tumour! I think because we are dizzy we can automatically assume it is to do with our brain lol. I recenty went to A&E becuase of having this dizzyness and feeling extremely drained!! However, the docs reassured me there was no bleeding or anything serious, infact it was most likely down to an inner ear virus which is affecting my balance.
I am not particualrly feeling wobbly but lightheaded and vacant. I am also feeling drained which is probably down to the constant anxiety!
Just drink lots of fluids and get some rest
Take care x