How much runway do you actually need before things get tight? The good news is you're in a better spot than most people in your situation - 18 months of savings is substantial, and that's exactly why you should reach out to your lender now rather than wait. You've got leverage right now that you won't have once you're behind on payments. Once you miss even one payment, the lender shifts from "how do we help this borrower" to "we need to protect our investment," and that's a much harder negotiation.
Your lender has options sitting on the shelf specifically for situations like this. Forbearance lets you pause or reduce payments temporarily while you find work. Loan modification can adjust your terms. Some programs let you roll missed payments into the end of your loan. The catch is that all of these work better when you're proactive. Call them, explain what happened, and ask what programs you qualify for. Have your loan documents handy and be clear about your timeline for finding new employment. Most servicers have a department specifically for this - it's not like you're calling collections or customer service, it's usually a loss mitigation or workout team.
One thing to watch: if you go the forbearance route, understand whether those paused payments get added back later or if terms genuinely change. Get everything in writing. And keep looking for work aggressively - the longer you can stay current or on a modified plan, the less this whole thing impacts your credit and your ability to refinance down the road if needed. You've got the savings cushion to buy yourself time, so use it strategically rather than just burning through it month by month while hoping things work out.