Credits in your account expire after 180 days.
If you had clicked the daily $.15 click and the $.02 paid email every day plus did some $.02 videos, posted 30+ contributory posts in the Forum each calendar month and requested the Forum bonus, you would have been ready for cash out long before the end of the 180 period.
If you currently have more than $25 in your account and of that more than $15.00 in offers (check the total and the split on left side of your account page), I suggest you request a cash out NOW so you don't lose any more of your credits.
When you request a cash out all of your existing credit go in a "pending cash out mode" and will not be subject to the 180 day rule.
If you are short of the required totals, try a few of the daily surveys (clear your cookies/temps before you start and leave the congradulations window open 5-10 mins after you completed the survey to allow time for the survey to credit - check your account page so you know when it has credied.) You may be DQ's on several surveys before you are able to complete one, but soldier on until you get one. (Once you complete a survey, you have to wait 24 hrs before you can try for another survey with the same company.)
Sorry that you lost your bonus and credits. I was dormant for a while and lost a few credits, but with all of the daily tasks, it's pretty easy to get to $25 in 3-4 months. Don't give up. Learn from your experience and move on.