I have been taking 100 mg twice a day for less than a week. What...

I started taking this stuff a couple of months ago and though my BP has gone down, the side effects really kicked in here recently. My eyes are always burning and itching. The ringing in my ears is constant. I walk 3 miles a day average but even that does little to "exhaust" the side effects. My body aches, (muscle and joints), and I always feel unwell like I'm not quite fully recovered from some illness. I have noticed a big difference in my sleep patterns.I'm always tired and I get only about 3-5 hours of interrupted/restless sleep a night.The dreams aren't as often as some of the posts I've read, but are vivid enough to jolt me out of a deep sleep and then I'm up the rest of the night. I've noticed some chronic pain in my hands along with swelling.Is this stuff medicine or poison?