Is anybody else going as crazy as me??

So we've been ttc for 7 months now for baby 3, I have spent a fortune on test and since Thursday/Friday last week I've had backache, cramps, fatigue, nausea, can't touch coffee (which I swear by to get me through the day usually) burning boobs at points and frequent toilet trips, I felt on such a high even though it's early to test thinking this could finally it!! I'm now on a major low just because I've got the munchies tonight so now I'm thinking af is on her way next week as I usually have a munchies day a week before af, so even though I've had all these symptoms it's still early to test do I still can't rule pregnancy out but I'm exhausted with these highs and lows.