11yr old shakes head as if something in his ear!

Me and my husband rescued Grizz from the local SPCA on Friday, November 27, 2015. The next day, he began to have diarrhea which cleared up by early Sunday morning. As Sunday progressed he became extremely lethargic and would not eat. We took him to the local vet, a VCA, on Monday Nov 30 and he was diagnosed with a yeast infection in both ears and GI parasites (roundworms and hookworms). Was given Panacur to deworm and drops for his ears. The following day, Tuesday, his lethargy continued and worsened to the point in which he would not move his head. We took him to the hospital at the VCA and found out he had a 104.9 fever. During the time of examination, his face and lymph nodes instantly began to swell and there was purulent discharge from his mouth. He was admitted for IV fluids and antibiotics. After no improvements and an onset of swollen painful joins on Wednesday, the Vets suspected Grizz had juvenile lymphadenitis. On December 3, he started on steroids, dexamethasone, but he only slightly improved. On Friday, Dec 4, we decided to care for Grizz at home and was given Clavamox (1ml/2xday) Enrofloxacin (0.8ml/day), Metronidazole (0.3 ml/2xday), Predisone (10mg/day), and Bupreorphine (0.1 ml as needed 3x a day) to administer to him. By the next day his fever had broken and each day he was becoming stronger where he was able to stand and eventually walk and play. The swelling had just about fully gone down by Tuesday Dec 8. After an initial check up on Monday, Dec 7, we were told to begin to taper the Predisone by 2.5 mg weekly beginning Dec 11. He was responding well to the initial taper dose until yesterday, Thursday Dec 17. Upon waking up Thursday morning we noticed he did not want to put pressure on his front left paw and was shaking. We took him to the VCA at 10am and he remained in hospital to be monitored and was administered his antibiotics, and an additional 5 mg of Prednisone (had already received his 7.5mg dose at 8am) and IV fluids. During his stay his fever reached as high as 104 but began to decrease upon us taking him home at 6:30pm. Throughout last night his fever increased again to 103.9 (temp taken by me by his rear leg pit). His continues to favor his front left paw and his shaking has persisted. Through his entire experience his appetite as remained strong and continues to do so. The most recent treatment plan is to increase Predinisone again back to 10 mg/day for 7 days where another visit will take place on Dec 24.