Mum2ela
I can't believe that they said 2 years - not exactly supportive, they told me a year. I had the same thing as you, 56 days, 35 days, 52 days etc. Using the temping and opk's I found that in the long cycles, it was as though I was having 2 cyces in 1, i.e the first with no ovulation and the second with ovulation. The temping might show you when to get at it ,if you are lucky to get a pre ovulation dip, but many people don't so you have to combine the temping with other tests like the opk's.
THe temping does tell you when you have ovulated, which can give relief to your DH, I know mine was especially relieved to get a break from all the bd'ing!!. I don't think that going on the pill will kick start your system, when you have to all intense purposes only just come off it. I had the same though having initial got pregnant first time after coming off the pill after 10 years. But these things happen, and I never could quite get to grips with the thought of not being able to get pregnant one one in the hope that the following it would work, but with no guarantees.
They reckon having sex every 2 to three nights will leave enough of the swimmers around that if ovulation occurs they are still there to go into action even if you haven't had sex for 2 days. Sperm are supposed to last 5 days!!
Know what you mean about going through opk's and cash over such a long cycle, but I would suggest buying the opk's online you get 50 for £30.
Sorry to have gone one, trying desperately to do anything but work at the mo
Goodluck and kept at it.