Q: All my contacts have disappeared from my phone and i have contacts I dont have a clue who they are along with almost all my pictures gone.  They are also gone from Icloud...Help! anybody

i have always had my phone automatically back up to Icloud.  I bought an Iphone 6 plus about a month ago and restored it from Icloud and everything was there.  Its been working fine.  I had over 3000 pictures and I had to buy more storage this weekend and all my contacts disappeared and I had contacts I didnt have a clue who they were.and most of my pictures are gone.   They are not even showing  when I go to Icloud Please help me figure out what I have done..