soooo, what happens when one of my holding in ISA delist from Nasdaq, am I still allowed to keep them in ISA or will they be automatically moved out and what happens to my ISA allowances? Thanks!
Your ISA allowance depends on your deposits through the tax year. When it comes to delisting, we’ve covered the scenarios below 
If, for example, a stock moves from NASDAQ to the OTC Market, it will no longer comply with the regulations applicable to the ISA accounts. In such cases, you can sell the shares at your own discretion until a specific date. Any positions that remain open on the specified date will be automatically closed.
This is easy.
The thing that impacts your ISA allowance is the cash you deposit/withdraw from an ISA wrapper per the U.K. GOV website.
Per the U.K. GOV website, stocks can be held in an ISA providing the primary listing is on an exchange the U.K. GOV have listed. If your Nasdaq delisting stock is still listed elsewhere, you can still hold it in your ISA, if it’s a market 212 support. If not you should probably do the sensible option now and sell it. Otherwise you might wait a while for 212 to sell it on your behalf.
Hope that helps explain!