Oh poor you, you have a lot on your plate.
How long have you felt like this, do you think it could be long standing untreated PND?
There have been a lot of discussions on here about when does being run down / stressed / sleep deprived etc become actual clinical depression.
It's very hard to say when one becomes the other, I suppose it's all on a spectrum. The thing I have found helpful to make the distinction is that when you can still function and get on with life, it's not depression, but when it really gets in the way of normal everyday functioning and enjoyment, then perhaps that is the time to seek help.
You do sound like you are tipping over into depression, I'm sorry to say it
Totally understandable with 2 demanding boys and from what sounds like 2 or 3 full time jobs!! I'm guessing if you have a farm, you don't get many holidays, am I right.
The heavy head / stiff neck thing doesn't sound at all right, I think you should get that checked out. It could well be from being hunched over a desk or over working?
I think you should go the the GP. Explain about everything, you might not necessarily need anti-depressants, but you might. They may want to do a questionnaire with you to see whether you are depressed.
One things for sure, you NEED to get some time for yourself, away from the boys. It's not a luxury, it;s a NECESSITY. You say you've got friends you can call, can you ask one of them to have the boys for an afternoon?