Thanks everyone.
Isn't it funny how people see things differently.
Some of the vets think he must have a lymphoma and doesn't have long, and the fact he has fluid in his abdomen confirms this. The partner thinks if he had a lymphoma the lab sample should have confirmed this because he sent away a big and obvious sample. He is more positive about Samson's future and isn't even convinced the fluid is related to the lumps, it may be he just has a small protein issue leading to a fluid leak ( not quite sure what this means.).He thinks because Samson's bloods are normal this is a good sign.
Whoever is right, Samson is on 2 diuretics and he is much less bloated, his stitches are out so he no longer has a collar and he was a bit snuffly but that has cleared up after antibiotics. He isn't on steroids as they can also cause a fluid build up. He looks amazing, his coat is sleek and shiny, he is bright and eating and snuggling up to me at bed time. His temper is better too since the collar has come off.
So, your guess is as good as mine, I did read on the internet to expect 2-6 weeks if he has a lymphoma, but most of the vets are saying it depends on how far advanced his 'cancer ' is. We will continue to keep an eye on him and hope for the best.
I will keep you updated.