I'm not too sure if there's something wrong with my cat or if she just
has a hairball that won't come up....

For the last 4 days she's been making coughing sounds, similar to when
a hairball needs to come up but then she'll stop and nothing comes up.
She's about 14 and overweight but is eating, drinking, using the
litterbox normally and generally seems to be fine.  The coughing is
every few hours for a few coughs and that's it.

Any advice?  Could it just be a cold?  My other cat gets colds and
sneezes and has a runny eye sometimes so thought it could be that.

If you could write back to me via email, that would be great.

Many thanks,
Laura