Help - scared and frustrated re mortgages

Hi there,  Bought off plan at  end of 2003 - was getting a divorce and had some capital.  Suffering from emotional trauma i did something very uncharacteristic and bought a property - a penthouse no less off - lured by idea of resale before completion.  After some time seeing the world I returned to the UK, settled down and began to think of what i had done.  Met two of the further stage payments but couldnt afford the third.  Thankfully was able to negotiate with the developer and downsized my apartment.  It is now, after many false rumours been finished and the habitation licence has been issued.  Being pressurised to complete asap but drowning in a sea of mortgage offers.  I am trying to hide the fact that i have a mortgage in the UK - it does not show up on my credit reports - not through my bank account  - and it is the only way i will be able to borrow sufficient money.... If i get a 70% or 80% mortgage even after paying fees i will get enough capital back to put in the bank and then pay the mortgage for the next two or three years....  hopefully i may also get some rental income to help out....  my belief has to be that i will be able to sell somewhere in the next 3-5 years to at least recoup my investment - is this a vain hope?  is the rental market good?  my property is slightly inland and i have been told this may be a problem.... also who do i trust for my mortgage - many appear the same - do not want a spanish bank account if i can avoid but many UK lenders wont allow me to rent...  what happens if my mortgage in the UK is discovered???   Should i go for snagging and to sign? once i sign will any faults then found be fixed?  HELP - losing much sleep over this and need to make some decisions asap - currently thinking of interest only for as long as possible - to allow me time to sell .... does this seem like a good idea - also trying to borrow the maximum i can even though it costs  a little more on a monthly basis - on the grounds that i will then have more capital to reinvest at home??   Any ideas or advice -please, please please