I hope this isn't every day either...yipes! Anyway, my husband works long hours and although he isn't traveling as much this year, when he goes it's for a week at a time, so it sucks. Plus he has his outlet, he plays rugby, and that entails at least one practice and most of Saturday for his games. So, I'm alone with our kids a lot, they are also almost 2 and 4.
Honestly, I stay sane by leaving the house! Laundry doesn't take priority, nor does cleaning my house, and although I udnerstand this wouldn't work for everyone, it works for us. Of course I do laundry, and I cook every night and I do all the other stuff, and I try and do it in a timely manner, I'm just saying I rarely stress about the cleaning stuff. I have found 2 other SAHMs that I get along with really well. We do a lot of stuff together. Sometimes it's just play at each other's house, sometimes we do craft days, some times we have each other babysit so we can get stuff done, some times we go out to places, etc. Sometimes we do free stuff and sometimes we pay for stuff, it's all relative. Even if you're on a strict budget there is fun stuff to do, you just have to look for it.
I would do some google searches on the computer for web based parenting "magazines" b/c they have a lot of free activities or look in like doctor's offices and stuff for those free ones. I use one a lot called KC Parent (for Kansas City Metropolitan area), but I'm sure there is one for your area! Plus, just going out and playing at the park or going on walks is good for fresh air and energy release.
You can also find good, somewhat inexpensive classes through your park district, especially for the older child. Soccer is big in the fall and I'm sure there is a camp or league available. If Parents Day Out is an option for you, I'd look into that as well. It's awesome for everyone! Your kids get to interact with peers, learn some skills, and you get a break to chill or task, whatever you want! Most places you can do either one day per week or more.
If you are at home, good toys are Play Doh, puzzles, board games, a play kitchen (both of them can use that!!), Little People toys (both my kids love those too), magna doodle, painting and other crafts, baking, etc. I also have a time of day for TV but I let my daughter (my son isn't really into it yet) watch an hour or two of TV/day. Sometimes she wants a movie, other times just different shows and there are days when she doesn't watch TV, although those are usually few.
It is really hard not to go crazy, that's why you need back up! I couldn't survive being a SAHM without my friends!