I'm curious. When your doctor changed your meds (he added another drop, right?) did he have you make an appointment to see if the changes in medication were working? I've had glaucoma for probably 15 years or so, and I've been through most of the drops that you can take. Everytime my doctor changes my drop prescription, he has me come in a couple of weeks later to see how my pressures are doing (and I've had laser twice--he definitely has me come in for followups from those). If your new drops are working okay and your pressures are coming down, then you would be fine until your next visit. But, if they aren't working, then further changes should be made. Is there a free clinic nearby where you could get your pressures checked? Or maybe one of those 'health fairs' (like at the senior center or mall) where you can get pressures checked? Many times, you wouldn't have to be a senior to have your IOP checked, especially if you explain the situation.
Those are kind of high numbers and I would want to get them down soon (if they aren't already lowering. They might be okay, and having the pressure checked by some means would give you peace of mind if they're okay). So far, my vision has been okay (except for my mostly lifelong nearsightedness) and I haven't lost any sight due to glaucoma. But I do go back to my opthamologist three times a year (which can be a hassle sometimes) because I am too scared of vision problems developing. I'm actually due to go back next month and hope my pressures are okay. I think last time they were 14 and 16 (I had my 2nd laser about a year ago, which has helped a lot).
Please keep us posted. Don't panic, but be diligent.