I am currently doing Byetta three times a day (non-FDA approved dose), along with 1000 milligrams of Metformin (one tablet, twice a day). I was able to cut back on the metformin after about a year on Byetta - I was starting to have some bad side effects from the metformin. I also stopped using Lantus when I started Byetta so I was really trading in one injectable for another that had different side effects.
When I was on the Lantus, I had an awful time with lows. I haven't experienced that with the Byetta. I did lose some weight when I first started, but I don't know if it was because of the Byetta or because I started an exercise and diet program at the same time (switch of doctors encouraged me). I am fortunate that my prescription coverage is paying for the Byetta at the higher dose, although I pay a full co-pay ($25) every 20 days. So I guess I am paying over a dollar a day for the Byetta.
I do not seem to experience more side effects if I eat more carbs/fat. I don't have a ton of side effects from the Byetta anyhow. When I first started, I had some nausea. But one trick that my educator shared with me was to do all the injections into the thigh and skip the belly - it seems to really help with the nausea. I still get it once in a while, but nothing serious. It passes very quickly.
The needle stick is very minor. Very short, very fine pen needle. My needles are provided free by my insurance company but before that happened, I used to re-use needles, even though technically you are not supposed to. But my educator told me the trick. I still do sometimes when disposal isn't handy and I don't want to carry around a bunch of used needles. Disposal in my state isn't difficult. I use a stiff plastic container (currently a laundry detergent bottle but on vacation I sometime use a hard beverage bottle such as Vitamin Water). When it is full, I mark it with a Sharpie as medical waste - do not recycle and duct tape it shut. Then I throw it out.
When they teach you to give injections, they'll show you to wipe with an alcohol pad. That lasted around a week for me. It was more trouble to carry them around than it was worth. I just put on the needle, and do the injection. If I am wearing thin clothing (like stockings) I just inject through the clothing if it is not convenient to remove it. I've been doing this for three years with no bad effects. At restaurants, if I don't have a good place ahead of time, I just do the injection at the table if I am wearing suitable clothing. Just takes a little advance planning. I avoid rest rooms because they just don't seem very sanitary to me. But I use them if I have to remove jeans or something to do my injection. In a pinch I'll inject into my stomach right at the table but that does seem to trigger nausea more often for me.
Good luck to you. Byetta isn't really bad once you get used to it. I am probably going to switch to Victozza (waiting for insurance to add it to formulary - expected later this year). Victozza is in the same class but requires injection only once per day and does not need to be timed with a meal. So it will be simpler - I'll just add the injection to my morning routine.
In the meantime, I use a frio pack when out and about in the heat and it works well. I wouldn't use it to keep my unopened stuff refrigerated but it keeps the in use pen nice and cool. And in the single pouch, I can still tuck a couple of needles.
Injectables are kind of a tough mental hurdle but once you get over it they aren't really bad at all. Maybe you can give up the metformin and then you'll only be dealing with one medication again eventually! I also gave up Actos when I went on the Byetta. Probably not soon enough since Actos has been linked to bladder cancer and I am currently getting ready for my second surgery for bladder cancer!
All the meds seem to have side effects - its kind of like trading one set for another as far as I am concerned.