Antidepressant honeymoon

So after my E.R. visit last weekend, I followed up with my doctor.  I'm back on blood pressure meds, and we discussed getting a different antidepressant, because Trintellix is $300+ for a month's prescription, and I just can't afford that.  We settled on Celexa, she said it would be the next best thing, and it's also pretty cheap, less than $10. 

I've been taking it for a week, and I am very pleased with the results.  I feel I have been less moody, and when I do hit a dark spot, it seems easier to shake off.  My worry is that this is just an initial reaction to the meds, and will wear off as my body gets used to it, like a honeymoon period where everything is great for a time.  I hope not though, as I almost feel normal.  I've been more responsible.  Well, a little bit anyway.  I took care of my parents-in-law's dog the other day without having to be asked, and yesterday I even did a load of dishes.  OK, so it might not be much but it's more than I have contributed lately.  I'm sure I could do more if I wasn't still working 7 days a week.