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It is possible this may be interstitial cystitis. But it could also just be severe overactive bladder. If they have not put you on medication such as oxybutynin to stop bladder spasms, this is where I would recommend they start. If that doesn't work, then they may need to consider putting you on medication such as Elmiron to see if this helps treat your symptoms. This medication is designed to treat patients with interstitial cystitis. Hope this helps.
Those specs do not sound normal. It does not sound like it is cancer if your cystoscopy was normal. Those specs may be sloughing of the lining of the bladder which could be a sign of interstitial cystitis. You need to discuss this with your urologist.