So I married Onmund a while back, and I guess I told him to wait in the orphanage after murdering Grelod (not sure why I did that) and then found him there. I've kept him as a follower since then, and we just raided Fort Snowhawk together. After clearing the place out we started making our way to Solitude where I passed the apprentice stone (he's still following at this point) and about the same distance from the fort and apprentice stone but in the direction of solitude I found an abandoned camp and took a book from it. This was too much to carry so I turned around to give some things to Onmund but he's suddenly gone! I know he was with me at LEAST until we got to the apprentice stone, and we didn't fight anything between the stone and abandoned campsite. I don't see him anywhere, and it's too damn slow to go anywhere without dropping my loot (most of which i plan to sell). I last had my horse near the college of winterhold, and god knows where he wandered off to (closest stable to there is windhelm I think) so I can't go anywhere.
Does anyone have an idea of how to either find him, use a console command to bring him to me, or is this a scripted event that I didn't know about? This just happened now so I haven't done much (any) troubleshooting myself before searching online, where I didn't find any answers quickly.