Medications will become more expensive, since most are hydrocarbon based.

Yes, but not directly for this reason, for most medications the cost of production proper is zilch, it's all R&D and marketing expenses.
There might be a longer lagging time for medications costs increases than for other kind of stuff.

An increase in the suicide rate seems likely.

That's what happened in the USSR crash, but isn't this a boon to insurers?

Regrading whether suicides are a boon to insurers, it depends on what kind of coverage the insurer is selling. If the insurer is providing pension plans or lifetime annuities, suicides are a boon to insurers. It might even help with long-term-care coverage. If an insurer is selling either term life or whole life insurance, there is usually a two-year period after a policy is sold where suicide is not covered, but after that, suicide is a covered coverage.