H-1B簽證緊急情況，求助小白兔及諸位大俠

我要去墨西哥簽證了（簽H-1B），我是最初簽B-1過來的，5年前在德州El Paseo那裏簽了一個F-1，還回了國。現在要去Tijuana簽H-1(這月底), Appointment 都約好了，突然在約Appointment的網站上（www.visa-usa.com.mx）發現一個大問題，實在是看不懂，又害怕。
網站上說：

Who Can Apply in Mexico：

Applications for visas that reflect a change of status (e.g., F1 to H1B or F1 to J) if the applicant has the original change of status notice (I-797) from DHS and the applicant originally entered the US in other than B status.
Applications for those with a B visa issued in their home country that includes an annotation indicating they are entering the US with an intent to change visa status, such as "Prospective Student".

Who Cannot Apply in Mexico:

Applicants who entered the US with a B visa issued in their home country that changed status to another visa category, e.g., F, J, H1B, but the visa did not have an annotation indicating intent to change visa status.

我有每月的pay-check copy，和original change of status notice (I-797)，也真的是在工作。但是我可是 “Originally entered the us with a B visa”, 尤其是“who cannot apply in Mexico”, 真是看不明白。 但是我又重新簽過F-1來美國，我能去Tijuana簽H-1嗎？

緊急求助，萬分感激。
Who Can Apply in MexicoWho Cannot Apply in Mexico