What a load of twonk! I'm sorry but no, love is not the solution to all problems... If you have problems then you sort them and/or yourself out until you are in a place where actually you can have a relationship on an equal level to another human being, love is not a quick fix to what irks you! It takes time, patience and work to be in and stay in love with someone but if they're worth it you do it and it takes no effort.
And your questions are silly, naive and entirely subjective, can love withstand all obsticals? Of course not! Some things happen that are just entirely too difficult for two people to deal with and sometimes life just changes. As I said, love doesn't fix a problem and in fact can sometimes make things more complicated.
Being in love will feel different to different people, some will get giddy, some will feel secure and warm and others will feel anxious... It depends on the person.
And as to 'the one'... I don't even know where to begin with that... I a world with literally billions of people, I find it hard to believe that people still believe in the concept that there is 'one' out there for you.... You're basically damn screwed if you're in England and your 'one' is waiting for you in the blooming arctic! I'd say it's as many as 1 in 5 people you could meet that if you're both in the right place, with the right mind set and enough attraction, you'd be able to form a meaningful, loving and caring relationship with.
Sorry to sound so negative but I was really struck by the twaddle.... Although it's safe to say, I'm not a natural romantic! ;0)