Dog throwing up/diarrhea PLEASE HELP?

i have a 8 year old er spaniel named buddy and for the past 3 days he has been throwing up yellow/foamy and has had diarrhea. for the last few years he has what i would describe as random seizures a few times a month, although the vet said that they went seizure's because he didn't lose control of his vowels and all of his blood work came up fine. he has about 5 random lumps on his body also. we don't have the money for another vet trip. if you have any idea of what is wrong or any medication i could give him to help his diarriea/throw up pleaseeePLEASEEE help !