Re: En inglés, por favor?
I'd bet I know less than you. I expect you heard Spanish as a child, and I learned it as an adult. But I think maybe I know the answer. Juntarse is to meet. I think I'd say "I met up with a bunch of problems..." and the "se" is just part of the verb. Pero el sujeto es problemas. I guess literally it would be "A bunch of problems met up with me".
Re: En inglés, por favor?
I would say:
"a bunch of problems came up and I had to solve them as soon as possible, but now they are all solved"
As regards your question, your sentence is written in a very common form of passive voice used in Spanish called "pasiva refleja"
http://spanish.about.com/cs/verbs/a/passive_se.htm
check this site to see how to use it
hope it helps;)