1. High blood pressure: It depends on how high the blood pressure is. People with high blood pressure are at slightly higher risk for bleeding. With surgery around the eyes, this can be dangerous because it could compromise your vision. You doctor needs to know how high your blood pressure is, how well controlled it is with medication or otherwise.
It is not an absolute contraindication to surgery, but certainly needs to be looked into.
2. Dry eyes: An Oculoplastics surgeon is both an Ophthalmologist and a cosmetic surgeon that specializes in facial surgery as it pertains to the eyes, so your best bet is to be evaluated by on an Oculoplastics surgeon that will determine your risk.
Again depending on the degree of dry eye, your may or may not be a candidate for surgery, and there are certain techniques of surgery that may minimize the risks of exacerbating dry eye [i.e., transconjunctival lower bleph, skin only upper bleph, etc]
Every patient is different in terms of their symptoms and potential risks, and even then different patients have different levels of risk accepting behaviour.
If you decide to explore this further, I would recommend consultation with an ASOPRS trained Oculoplastics surgeon. You can find one close to you on the ASOPRS dot org website.