Some of the stores here do carry it. My primary source went out of business while we were on vacation.

That was a major bummer. A couple of stores carry the Penne, but i was having major problems finding spagetti.

I finally found it at Plum Market. If you have a Whole Foods out there, they may have it.

Tinkyada is the best I think. Some of the others are fast glucose makers, and that is not good for me either.
Tinky is brown rice and digests slowly. It takes longer to cook, and often finishes in the last minute. So I typically watch it then. 2 servings take about 10min for me at a full boil.
I put the spirals or penne in soups too.

There are buckwheat pastas too, you can use. But I think they are too high a glycemic index for me. Many gluten free people use buckwheat products.

You will be paying more for your food...just accept that.
The bread is the worst thing to give up IMO. I used to do peanut butter on rice cakes, etc. I never made it to 100% GF, though. My stomach issues calmed down, but that may be because of the few sugars I was eating too. Now that I got rid of fructose, I don't have the GI fast transit problems any more. Many of the GFers make their own bread, tortillas, etc.

I always take the magnesium after a meal. Otherwise I get loose, too.

Your heartburn may resolve when you get going on GF.

It takes time to adjust. So just see what you can do from day to day.