I'd suggest life alert if you have use of any limb that can push the button--they will install a speaker in your home that you can talk in--if you can still speak.
In lieu of that--if there is a health issue with your husband, too--have you considered perhaps a live-in person that would put a baby monitor in their room so you can call out if you need help? Or a close neighbor that could have a monitor in their home in an apt. building?
If you can use any limb--perhaps a big-button phone on a land line--pushing 911--even if you can't speak--will get them to the home.
if you can get an ear piece for a cell and use any limb to turn it on--some of the ear buds are voice-activated, I believe. Perhaps the ALSA group in your state might have some ideas, too.
Edit to add--you're using the computer--there is a phone called magic jack--it hooks to your computer--and you can dial it right from the computer--and it has 911 available, too. With a headset--you can use it totally however you operate your computer you're typing on.