Big gaps in my teeth after having tooth pulled out and wearing rubber bands.?

I have braces for over a year and a half now and i had to get two bottom teeth pulled out. I think this was around July last year. The gap is almost closed probably could take another few months though i am wearing the strongest rubber bands full time. The only thing is the tooth behind the one they are pulling foward to close the gap were my other tooth had been pulled out has now separated from the one they are pulling foward so i have another huge gap! its painfull when i eat as the food gets stucks especially eating hard food like chips and nuts. Is this ment to happen? will the Orthodontist fix it? i was meaning to ask last time but they were so busy i had only a istant changing the bands. I also havent had them tightned in like 3 months and it feels like they are going back to were they use to be. Why is this?