So... I was about to craft my Runed Fel Iron Rod. I had all the items in my inventory, even the Runed Arcanite Rod which I crafted a day ago (a really expensive thing) Went to the auction house to see if there was a cheap Fel Iron Rod because it was the only thing I was missing to craft my beloved Runed Fel Iron Rod. Good I found it for 100g( cheaper than what I saw yesterday- They were 400g+) So I bought it and when I opened the enchant window all the items needed were shown there and in my inventory aswell. A guy pmed me to create a portal to dalaran(I was at orgrimmar bank) I closed the enchant window and looked at my inventory If I had rune portals, I didnt have any so all I did was ignore him. When I opened the enchant window I was surprised because I was missing all the items. All I had was the Fel Iron Rod I bought. I reloged, I thought I may be a visual error or something is interfering with my icons to not be seen. Disabled all Addons and still my items aren't coming back. I didnt discard them nor sell it... Any idea of what happened ?
I'm completly new to WoW so if there is a bag where items go when the inventory is full it would be good if you guys tell me. I don't know where all those items went. Just switched characters and nothing :/. I'm desperate, It really took me days to farm the gold to buy the items not to mention the Rod that I crafted while leveling up enchant.

Sorry If I gave detailed information but I think it was necessary. There may have been a known bug/glitch I wasnt aware of.