No.yuo poor love,you have been badly advised!
it is quite simple really.
The more you let your baby suck,the more milk you will make for him.If he screams for more,you put him back on the boob.
If you start introducing bottles,then there is less demand on the breasts thus they make less.
It's easy to see where it can all go pear shaped isn't it.
What you express is not an indication of how much milk you have,I was a poor expresser but managed to breastfeed for a looooong time.
Your HV really should know better than to offer such crap advice.
You need to perhaps spend a few days on staying home with the baby and feeding him for as long as poss and however often he wants it.
Some people suggest what is called a 'babymoon' literally stripping off and taking to bed with the baby to get their supply up again.
You're quite right re there being no point to breastfeeding and carrying bottles everywhere but it is important for you to understand that as long as you are giving bottles,your suplly will sadly be low.
Maybe talking to one of the helplines would be a good idea?
Try lovely folk at Assoc for breastfedding Mothers
0870 401 7711
Don't let misleading information make you give up breastfeeding.