Can't use Desktop AT ALL

I was clearing out my laptop and I decided to delete my dropbox as I don't use it anymore. When I deleted my dropbox from the trash the whole of my desktop disappeared (minus the background). Evidently, the files for my desktop must've been in my dropbox. Since then I have tried to use Time Machine to get the files back but I must've not backed up my files and I cannot get them back. Now I don't have a desktop folder on my laptop and I cannot place anything on my desktop as I get a circle with a line through it whenever I try and drag and drop. PLEASE HELP I am so desperate as I use my laptop everyday! Thank you so much.