Levaquin and diltiazem

My mother is on levaquin for a urinary tract infection which had gotten worst than we thought . The infection had set up in pockets behind her rectum. She is on levaquin, and other medicines such as; digoxin, metoprolol, lipitor, diltiazem and lasix. I am so afraid she is on medicines that can do more harm than good. She also suffers from congested heart failure. After she returned home from the hospital stay she extremely weak, is this a results of taking the antibiotic ( levaquin or a combination of all of the drugs listed above)?

HOLY COW there's alot of Levaquin joint pain happening...
I don't usually experience medicine side effects so this is scary and confusing, and I'm so glad to have found this forum.
My experience with Levaquin started with a Lupus flare two weeks ago, for which I was put on prednisone, and diltiazem for pulmonary hypertension, and a diuretic to decrease edema. The prednisone left me vulnerable to some crud that whipped up a big pneumonia 6 days ago, so I got to spend a couple of nights in the hospital... Having cultured the bacteria from the pneumonia my doc decided to prescribe Levaquin 500mg/day and the joint pain began less than 48 hours after my first dose. EXCRUCIATING bilateral knee pain radiating upward from the feet, at 4am... I was crawling down the stairs to get to the Tylenol and it took forever.
So I asked him about it this morning and he said it usually just affects Achilles tendons. Hmm. I should have asked for a new antibiotic but I thought I'd tough it out with Tylenol - so - tonight I did just that, had 1000mg Tylenol before bed and yet still had some severe foot pain.
Now, I think I'll stop this Levaquin adventure altogether and get some new med, hoping the side effects will GO AWAY!!!!