4 outlets and 2 switches not working

Check all the outlets again. If any have backstab connections instead of using the screw terminals, move the wires to the screw terminals. If a backstab (or any other connection, but notoriously backstabs) is marginal then it can result in arcing and overheating. But if it is just slightly more out then it will simply not work at all and all the downstream outlets won't work either.

After ruling out backstabs and obvious flaky connections, the next step is to figure out if there is another outlet "somewhere". That may sound crazy, but I have one circuit that runs, literally, all over 2 levels of my house.

You've already started in the right direction by testing the outlets and the breaker. You have verified that there is power, you just need to continue to isolate the problem. There are two common things that might be wrong. First test the outlets not working if you haven't already hot to neutral and hot to ground. You may have a loose neutral also.

Next you need to find the other outlets and junction boxes on that same circuit. You can do this by turning off the breaker and finding all of the outlets not working under this scenario. Try and mentally visualize the outlet closest to the outlets not working. You are looking for a loose, burnt or broken connection in the boxes prior to the outage. See picture for clarification.

Do you see what I am trying to get at? If you do find the problem and while you have the boxes open you might as well go ahead and pigtail the outlets. That way you only have one outlet stop working and that will make it easier to locate. See picture.

Good Luck.