Question about going back on depo provera....nurse or doc if possible to answer?

ok it has been probably about 4 or 5 yrs since i have been on depo. i took it for that long. i started when i was 16 years old i am now 24. i am now on pills (ortho tri-cyclen regular) i have tried so many because i have such bad problems with breakthrough bleeding. i am at my wits end. i have been on ortho now for 3 full months this is my 4th and i am on pill 13. i had not been having any problems with the bleeding til now. i take my pill on time everyday. the problem is i have been re-reading info on the depo and see that bleeding is the main side effect. i dont remember having many problems back then with bleeding but im scared to go back to depo i do know that i only had maybe 2 periods a year after the first two injections. so would my body still react the same way as it did back then or will i have to suffer with bleeding irregularities for a long time. i am so tired of constantly bleeding when i do have the bb spells it is for 2 weeks at a time. i have tried tri-phasil (switched to make migraines less frequent) to alesse (breakthrough after a year) to jolessa (breakthrough after a year) to now ortho reg- breakthrough now on the 4th month. i dont know what to do and would like some advice. thanks