I agree with @susanm9006, you can't force him by picking him up and putting him on the bed - actually that helps to re-enforce his fear rather than letting him get over it. Since he is not using the walkway you created, I would suggest removing it - so that things are back to where they were. He is going into the room when you are home, so that in itself is a good thing. So, that says he does want to be with you, as he only avoided the room entirely while you were gone, correct?
Now, he will just have to work it out on his own to get over the bed thing. Since it is only the head of the bed - how about something to do with the pillows, or the headboard? Strange noise (to him) coming from an alarm clock or a lamp?
As far as Prozac, it is way to early to decide to do something so drastic. After all, his behavior, if I understand correctly, only has to do with your room - and more so now with your bed. You can try calming products on him, such as Bach Rescue Remedy which are drops you can rub into a cat's ear. You might have try more than one type, as not all of them work on all cats. But, if you chose to try this, I would only do it at night when you are trying to get him to be in your room with you. Maybe, you could try it when you are working from home too.
If you don't want your housemates placing his food bowl elsewhere in the house while you are gone, tell them to leave it where you designate it to be. He has been going in there to eat, and so there is no reason to place it anywhere else.
Now, he will just have to work it out on his own to get over the bed thing. Since it is only the head of the bed - how about something to do with the pillows, or the headboard? Strange noise (to him) coming from an alarm clock or a lamp?
As far as Prozac, it is way to early to decide to do something so drastic. After all, his behavior, if I understand correctly, only has to do with your room - and more so now with your bed. You can try calming products on him, such as Bach Rescue Remedy which are drops you can rub into a cat's ear. You might have try more than one type, as not all of them work on all cats. But, if you chose to try this, I would only do it at night when you are trying to get him to be in your room with you. Maybe, you could try it when you are working from home too.
If you don't want your housemates placing his food bowl elsewhere in the house while you are gone, tell them to leave it where you designate it to be. He has been going in there to eat, and so there is no reason to place it anywhere else.