Acquiring Heclo with rising interest rates

Hi everyone! 

I was housing hacking a duplex I purchased almost 2 years ago. I decided to rent out the whole place and move back in with the rents until I purchase my next house. With both units rented out it'll cash flow 1,200 a month. so I'm looking to get a Heloc since I have enough cash flow to float the cost. I'm trying to pull out 50k to use as a down payment on the next house hack. I'm having trouble finding a bank that will loan out to an investment property. should I keep shopping around or wait since interest rates are increasing.

Thanks!