Hiya,
i am sorry to hear that your robo is ill
The best thing woud be to get him to the vet straight away! They can go down hill so quickly, you really need to get him to the vets as soon as possible.
Someone on another forum asked a similar question the other day and when she got to the vets they found out that she has a tumour which was making her breathing difficult - this may be the same with your robo, so please get him checked out as he could be in a lot of pain
Please let us know how you get on.
Tammy x