It's hard to say. You might need to do some research or look for reviews and comments from people who are familiar with it to find out if it's based on a novel.
Some second - hand bookstores or websites that specialize in selling second - hand books might also have 'ishq ka dard hai complete novel' at a more affordable price.
I don't know the origin of the 'rabba ishq na hove full story' as it's not a widely known story to me. It could be from a small community or a local cultural heritage.
I'm sorry, but I'm not specifically familiar with a story named 'ek ishq ek junoon'. It could be a relatively niche or regional story. You might want to check local libraries, cultural centers or online forums dedicated to the relevant culture for the full story.
Not having knowledge of 'tu ishq hai', it's impossible to accurately describe the main plot. It could be a complex story involving multiple characters. Maybe there's a protagonist who discovers the true meaning of love in unexpected ways, or perhaps it's about the rediscovery of love after a long time. But again, this is all speculation without more information.