Continuous use of aspirin is kind of hard on the joints.
I know aerobars aren't very popular with tourists partly because of the problem with handlebar-bag access, but I find that half their value is in the relief they offer for my wrists, elbows, shoulders, back, and even my rear. They do take some conditioning of their own, and it takes time to learn to control the bike differently so you have the desired stability; but I won't do any long rides anymore without them. For long-term comfort, it is important that they fit right, with your upper arms being nearly vertical, not stretched forward, as viewed from the side. Get ones that have the arm pads behind the main bar, not directly over it. Also, get ones that angle up where you hold them, so you don't have to angle your wrists down unnaturally. I probably have 30,000 miles on them now, not just with them, but actually on them, using three separate pairs of the Syntace C2 model on different bikes. Since that's where my hands usually are, it made sense to put my shifters there too, so I have bar-end shifters on the aerobars on the bike I ride most. This has become my favorite set-up.
As for the neck-- it is common for people who are new to cycling to feel like they have to hold their head way up facing directly forward instead of partly down, putting quite a bend in the neck (and exposing your face to more sunburn danger). There's no need to hold the head up so high, and you usually have to be watching for road debris right in front of you anyway. Unfortunately many modern eyeglasses are made so small that a more normal cycling position means you look over the top of your glasses instead of through them. That said, my neck does still get tired at the beginning of a cycling season after the winter when I've been riding very little and I'm turning up the miles again, but soon it becomes a non-issue again as my neck gets stronger.