First of all, stress is not, at least in my case, the reason for my inability to conceive. I could be sitting on the beach 24/7, getting massages, eating and drinking fabulous food, being waited on hand and foot for months and still not be able to conceive. So I disagree with it being “absolutely a reason for our inability to conceive.”
Second, I would be very careful about stopping your life to focus on infertility. How much time are you going to spend “focusing” on starting a family - what exactly does that mean? Scheduling and receiving treatments, taking time to relax, yes, that all takes time and attention - but as much as full time job? It didn’t for me. Perhaps you can talk to your supervisor and rework your role a little if you feel it’s becoming stressful.
If for some reason it does not work out, you may not have much to fall back on. When we were considering dropping out of TTC due to multiple failures, it was comforting to know that I had my career, school (I am in school part-time), and several other interests to pursue if I was unable to get pregnant.
From a practical perspective, I wouldn’t quit my job in this economy, especially if it’s something I’ve enjoyed. I would caution against becoming a stay at home mom before you get pregnant - you say “what’s one year” as if there is a guarantee that within a year there will be a baby there. I know that sounds harsh, but I have been in the same place mentally and what I wanted did not work out the way I had planned and hoped.
When I was starting this journey I got some great advice from someone who had been there - pursue life as if you’re not TTC or you won’t be getting pregnant any time soon.
That said, it is a personal decision. I would not recommend it, but I wish you the best of luck in deciding.