Navigating utility bill spikes during winter with a fixed income

I've been living on a fixed income since retiring last year, and the recent cold snap has sent my heating bills way higher than usual. I live alone in an older apartment with drafty windows, so despite turning the heat down, the bills keep climbing. I've tried layering clothes and using space heaters in just a couple of rooms to save money, but my electric bill still doubled this month compared to last. I'm worried about keeping up with these fluctuating costs without dipping into my emergency savings. I’m considering weather-stripping my windows, but I’m not sure if the upfront cost is worth it or if there are better low-cost fixes. Also, has anyone had success negotiating payment plans or assistance with utility companies when bills get unexpectedly high? Has anyone dealt with similar winter utility bill shocks on a fixed income? What practical steps helped you reduce costs or manage payments without added stress?