If you can add these loans to your mortgage, but still repay them over 3-4 years, then it might be a good idea.
But adding them to your mortgage over the remaining term (e.g. 20 years or whetever) is almost certainly not as the interest cost will be significant.
You will need to have equity in your home before you can remortage, i.e. the value of the property will need to be (significantly) more than the value of the mortgage outstanding.
Remortgaging may only be a short term solution to your cash flow problems-you also need to address all other aspects of your spending.