I am sorry to hear that Toby is not doing well, vomiting daily for the past week and now refusing to eat anything, even favorites like bacon.
I cannot say whether the multiple lumps on his body have anything to do with his change in appetite and vomiting. It is possible for tumors to spread (metastasize) and affect internal organ function. But at his age primary internal organ function (kidney or liver failure or ketoacidotic diabetes) are reasonable possible causes for his symptoms too.
If he is vomiting consistently and refusing to eat he will become very weak and dehydrated and that can lead to him passing away. Since his symptoms have persisted and worsened I think it is time to seek hands on veterinary care.
I understand you may not have the ability to have him seen today because it is a Sunday, so at home to try to settle his stomach and get him to eat you can give either:
1) Pepcid ac (famotidine) at a dose of ¼ of a 10mg tablet per 5 to 10 pounds of body weight every 12 hours
2) Prilosec (omeprazole) at a dose of ¼ of a 20mg tablet per 10 to 20 pounds of body weight every 24 hours.
These are acid reducers, are very safe, and may help him feel better. They can be used as needed.
A couple hours after the acid reducer is given offer clear broth to drink or ice cubes to lick.
If that goes well you can also try a bland diet with increased fluids to perk his appetite and get him better hydrated. A homemade diet for this is 1/3 boiled, lean hamburger or boiled, white, skinless chicken, all fats and juices drained off the meat, and 2/3 boiled, plain white rice. Add low salt beef or chicken broth to his meals as well to improve palatability and get more fluids in which should help as well.
In an older fellow with these sorts of symptoms it is likely he has some sort of serious disease process going on if he doesn't respond to simple supportive care. He needs diagnostic testing to further evaluate him. There may be some simple things we can do to help him, or it may be that he is too sick to help, in which case you may need to consider humane euthanasia. I know he is a well loved family member, but I also know that you don't want him to linger and suffer or you wouldn't be here asking for help.
Best of luck with Toby, please let me know if you have any further questions.