Would it be bad if I took expired pepto Bismol (bismuth subsalicylate) tablets? ?

No. no, its ok as long as it's not significantly (like 6 months or more) past expiration. The only problem at that point is potency and theoretical breakdown of the ingredients. However, it usually wouldn't cause any minor harm and definitely not serious harm.

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May I take a pepto bismol (bismuth subsalicylate) tablets an hour after I had taken Garlic Echinacea? I have some nausea.

Stop self-treating! Nausea may be GI-related (food poisoning, peptic disease, gastroparesis, due to biliary & pancreatic disease, gas/bloat syndrome, small bowel problems). Consider "central" causes: motion sickness, vertigo, migraine headache, brain problems (some very serious). Also, rule out infection (? urinary tract), medication side effects, pregnancy, & even reaction to stress. Find & treat the cause--see doc. Read more...