What kind of treatment options are there for those with low blood pressure?

Jwlu2 asked...

My mom has had very bad headaches for several years now. She would also experience pain behind her eyes and something that could be described as her hair hurting. She also has hypotension. She recently had to go to a hospital with stroke symptoms and was given blood thinners to remove a potential clot. Later the scan showed no sign of clot, but her bad headaches continued. All the drugs that are used to help with her problems are designed for people with hypertension and can't be used for my mom since she can't have her blood pressure lowered. Are there any treatment options aimed specifically for people with chronic low blood pressure?